Specifications

Chapter 7: Theory of Operation
Front Panel Assembly
130
Front Panel Assembly
The front panel assembly consists of a front panel board, on/off board, display board,
touch screen and controller, AutoProbe II interface board for probe power and probe
control, backlight inverter board, front panel connectors, and cabling connectors for the
AutoProbe II interface.
Front Panel Board
The front panel board provides the main user interface to the instrument through
dedicated knobs and pushbuttons. It also provides power and communication to the
probe interface. The front panel board receives power from the backplane board through
a dedicated cable. The communication link to the board is USB to the motherboard.
The on- board USB hub serves the FPGA microcontroller, the touch screen controller
board, and three front panel USB connectors for peripherals.
Figure 7- 8 shows a simplified block diagram of the oscilloscope front panel.
Figure 7-8 Front panel
On/Off Board
The on/off board interfaces with the motherboard to provide the on/off switch function,
and with the backplane to provide the probe compensation output. Power indicator
LEDs backlight the on/off pushbutton and are driven by the motherboard. The probe
compensation lugs connect to the calibrator output on the backplane through an SMB
connector coax cable. An ESD protection diode sits on the on/off board, connecting the
signal and ground probe compensation lugs.
AutoProbe II Board
The AutoProbe II board uses an I
2
C interface to communicate with the probes.
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